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Anthony Trinh and Rich Zieminski Department of Computer Science, Columbia University { akt2105, rez2107 }@columbia.edu
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Content changes require new access methods ◦ Larger content ◦ Different Content ◦ Greater reliability ◦ Concurrent Multipath Transfer using Stream Control Transmission Protocol (CMT-SMTP) ◦ Multipath Transmission Control Protocol (MPTCP)
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SCTPMPTCP Multi-Stream Protocol Message Oriented (Multi-byte chucks) Out of order delivery Multi-home capable Failover Supported Transport Layer Application code changes required Processor Intensive Multi-Stream Protocol Multi-home capable Failover Supported Backward compatible with TCP ◦ Requires code changes to utilize full potential Potential for higher delay and jitter Requires network stack modifications
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An OS for Network Testbeds ◦ Wired and wireless test nodes ◦ Multiple OS’s, various hardware ◦ Configurable routing schemes Configured using common simulation tools ◦ The Network Simulator 2(ns-2)
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S ample ns-2 script Node configuration Technology Bandwidth (Mbit/s) Delay (ms) Packet Loss Ratio (%) Downlink Uplink Ethernet (ref) 100 21 4G-LTE 100 305 3G-HSPA+ 56 22 809 802.11g54 22 Ethernet (lan0) Delay Node (wlan1) Server (node1) Client (node0) Delay Node (wlan2) Delay Node (wlan3) Emulated Network Topology
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Future Work ◦ Varied message size testing ◦ Test other performance metrics Delay, Jitter Real application performance ◦ Link Aggregation Redundant links (fault tolerant) ◦ Recovery time after failure
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